<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>float</title>
		<style type="text/css">
			*{
				margin-left: auto;
				margin-right: auto;
				text-align: center;
			}
			#mother{
				width: 700px;
				margin-top: auto;
				margin-bottom: auto;
			}
			#top{
				width: 700px;
				height: 100px;
				margin-bottom: 10px;
				background-color: tan;
				float: left;
			}
			#left{
				width: 150px;
				height: 300px;
				background-color: lavenderblush;
				margin-right: 10px;
				float: left;
			}
			#center{
				width: 300px;
				height: 300px;
				background-color: chartreuse;
				float: left;-
			}
			#right{
				width: 230px;
				height: 300px;
				background-color: rosybrown;
				float: right;
			}
			#bottom{
				width: 700px;
				height: 100px;
				margin-top: 20px;
				background-color: bisque;
				float: left;
			}
		</style>
	</head>
	<body>
		<div id="mother">
			<div id="top">top</div>
			<div id="left">left</div>
			<div id="center">center</div>
			<div id="right">right</div>
			<div id="bottom">bottom</div>
		</div>
	</body>
</html>
